<< BTW I am in the process of researching a fiber optic tach for
 the turbo RPM. I will feed the fiber optic cable down the exhaust
 pipe of the compressor to look at the compressor blades and count
 them as they go by with a high speed photo diode I hope.

 Paul Lamar >>

Turbo tachs are well established.  A magnet is inserted under the compressor
nut and a simple coil outside the (aluminum) compressor housing outputs a
once per rev pulse.
Jeff Spitzer

Can you buy those parts someplace for a TO3 Jeff? I think TO3 parts fit
the stock 88-92 Mazda turbo.

Paul Lamar
 
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